Tool for facilitating the regrinding of ignition contact-points.



S. ORBQN ST l. vcNAlR. TOOL TOR FACTLTTATTNG THE REGRTTJDTNG 0F TGNTTTON CONTACT POINTS.

APPLICATION FlLED )UNE 20, 91?.

15 circuits of ignition systems, particularly of l; Fig. 3 is a bottom plan view of the desfraraewrarnnfr carica.,

STEFAN URBAN, F NEW YORK, AND JAMES T. MCNAIB, 0F BROOKLYN, NEW YORK.

TOOL 1F01?.l FACILITATING THE REGRINDING OF IGNITION CONTACT-POINTS.

i $85,344:. ameiwtiwf Lettore Patent Patented Nov. a9, 19de, Application filed I une 20,1917. Serial No. 175,836.

To all whom t may concern.' A further object is to provide means to Be it known that we, STEFAN OnBAN, a enable the adjustment of the contact holders native of Hungary, residing at New York, according to the position required. county of New York, State of New York, lith these and other objects in view our 60 and JAMES T. McNair, a citizen of the invention vconsists in the construction, ar- United States, residing at Brooklyn, county rangement and combination of parts as will of Kings, State of New York, have invented be hereinafter more fully described and set certain new and useful Improvements in forth in the appended claims. Tools for Facilitating the Regrinding of lgln the accompanying drawing which 65 nition Contact-Points, of which the folloW- forms part of this specification and in which ing is a specification. f similar reference numerals designate corre- The present invention relates to means for sponding parts in the different figures, Figfacilitating the regrinding of ignition conure 1 is a rear elevation of the tool; Fig. 2 tacts such as used in magnetos or primary is a longitudinal section on line 2-2 of Fig. 70 the kind known in the trade as Delco tungvice; Fig. 4 is a side view thereof;l Fig. 5 sten contacts. is a cross section on line 5w-5 of Fig. 1; Fig. It is a well felt disadvantage of such con- 6 is a cross section on line 6-6 of Fig. 1; tacts, that yafter a comparatively short use and Fig. 7 is a modified form of construc- 75 they fail to operate by reason of the fact tion of the plate holding the breaker arms that the contact surfaces burn or wear off and Figs. S and 9 denote modified forms of and become uneven. `The contact points as holders for contact arms. now in use are permanently ixed in holders, ln the example shown the contact holders of which one is known in the trade `as are of the type known as the Delco contacts 80 breaker arm and the'other as contact screw, which comprise a set of two, one consisting one breaker arm and screwconstituting a of an arm B which at one end has permacomplcte set for a magneto or primary cirnently fixed to it the contact point c an cuit, of an ignition system. When the conthe other consists of a threaded pin C havtact surfaces become uneven owing to burn in at one end a head in which the contact 85 oi" wear, the rntire set ora part of the set 'point c is permanently fixed. But while has to be discarded and replaced, which our tool is particularly designed for the reowing to the comparatively high price adds grinding of contacts of the Delco type the materially to the upkeep of a machine. On saine is equally applicable to contacts of the other hand, the removal of theworn other types of 'milar construction but dif- 90 contact points and their replacement by ferent sizes.

new ones, involves labor, the cost of which The tool consists of a frame made of brass is about the same as that of a complete piece or 'other suitable material and which comor set. Attempts have been made to reprises a base portion 1 having a smooth and j grind the' surfaces of the contact points, but even bottom 2 in which are provided a cross 95 4o owing to the lackof a proper tool for holdgroove cross grooves 3 extending throughing the parts have not been successful, since out the' width of the bottom and one or'more even with the most skilled and steady hand, substantially circular' holes 10 projecting it is impossible to hold the parts perfectly upwardly from the base-are arms or posts 4; even on the grindstone. for the fastening of a handle 5 made, as 100 The object of our invention therefore, is shown, of a piece of metal bent upon itself to `provide a tool in which both, a breaker and formed with a rounded upper surface to arm and screw or several sets can be propform a convenient grasp. At the rear the erly supported so that during the grinding base is provided with ribs 1, which project process, they will rest evenly on the grind downwardly below and at a right angle to 105 stone and will not be affected by the shak- "the bottom 2 and the front surfaces 12 of ing of a hand. which are also smooth and even, to form Another object of our invention is to so guide surfaces as will be hereinafter more construct the tool as to hold breaker arms fully described. Procting rearwardl from and contact screws of various sizes, and give the base are latmem ers in form of p ates 6, 110 Ait thus the character of a universal tool for in which are suitably mounted members 8 inv this purpose. form of circular disks' or the like-So as to Be capable of turning on central ares runnin longitudinally ,of the base. To cach of these disks is eecentrically fixed a pin 9 extending parallel to the base and at some distance away from and transversely to the cross groove 3. The axes of these' pinsfare substantially even with the bottom of the grooves 3. @Wing to their eccentricity relative to the disks 8, they can be adjusted to extend a trifle higher or lower from their original position. These pins serve as supports for the perforated ends of the breaker arms B, the same being so admeasured in diameter as to loosely fit in the circular holes of the arms B. The contact ends of the breaker arms B to extend through cr into the cross grooves 3 with their contact points projecting sufliciently outwardly from the grooves, so that when the tool is applied with its bottom to a grinding surface they will be in contact With and acted upon by the latter. In order that these ends of the arms may be retained in the grooves 3 during the handling of the tool the grooves may be admeasiired to snugly or with. a slight friction engage the contact ends of the-arms B, or 1n order to alf loW for variation in sizes or to compensate for Wear a screw pin 12 having a cam shaped head 12 may be used which with its head projects into the groove 3 through a recess 3', so that an adjustment of the Wldth of the groove may be possible. Of course the said adjustment may be obtained by any other suitable means.

Since the holes b in the arms B may also vary in diameter, instead of solid pins 9 split pins or springs 9 (Fig. 8) may be used. As the contact points c, 0 are usually not very thick` pieces and it is -not desired to grind ed more of their surfaces than actually necessary to even them up, these points must be so vsupported in the grooves as to yield vertically so that when the even bottomvvof the tool is placed onto and moved over the grinding surfaceA only the uneven parts of the Contact surfaces will be ground olf. To accomplish this vve` provide a spring member 7 which maybe fixed to or mountedon a projecting pin ci' the frame and which Willv extend across the grooves 3 so as to engage the upper surfaccsof the contact ends of the `arms when the same are inserted into the grooves 3. The spring will have the tendency to press the contact ends outwardly in the measure as they are bein(r ground oil' untilv their Surfaces are perfect y even with the surface of the bottom 2 of the tool.

F or scciiredly holding the pins 9 in adjusted position, the disks with locking varms 8 Iwhichare adapted to Vci'igage ridges or furrow/s6 arranged on the platesi'radially relative'to the disks 8.

The circularlgiole or lio-les 10 in the base serves ,for the accommodation of a member when applied are adapted with sockets tlici'ein for 8 may be providedv 11 formed with a threaded bore 11 into which the threaded pin C forming the other holder of the set of contacts is supported. This member 11 'is likewise acted upon by a spring?" suitably supported in the frame and serving to ibrm a resilient rest for the contact point c. The upper end of the member is somewhat, enlarged forming a shoulder 112 which will rest on the top of the base and thus prevent the member 11 from falling out from the hole 10.

In moving thc tool over the face the guide ribs l With their even surface l2 may be held in contact with a side surface of the grindstone so as to aiiord a rectilinear movement of the tool. As there are some breaker arms in use which instead of holes b grinding surhave pins for their support in the'magneto,

the plates 6a may be provided with perforations 6b instead of with pins 9,' s o as to form sockets for the' pins ofthe breaker arms. A number of such erforations Will enable the support of brealier' arms of various length. Our tool is primarily designed to hold the two contact pieces of a set, so that the grinding of the set may be performed at once. But it is of course clear that it may Ahave two or more cross grooves for the contact ends of several breaker arms and'also a number of circular bores forA several contact screws.

The construction described is only one embodiment of our invention which may be variously modified Without departing from the spit of our invention. We therefore, do not Wish to restrict ourselves to the details described and shown.

What we claim and desire to secure by Letters Patent is: i y

1. A tool for facilitating the regrin'ding of ignition contacts onv a grindstone, comprising a hand piece having a grooved level bottom and .sockets therein for such contacts and means in .said sockets for supporting a contact in said bottom during the grinding process.

2. A tool for facilitating the regrinding of ignition contacts o'ii aigrindstone, 'comprising a hand piecchaving a level bottom means in said sockets portingsaid contacts 1n the grinding` process.

for rcsiliently supsaid contacts and L said bottom during 3. A tool for facilitatingthe regrinding of ignition contacts on breaker arms, comprising a hand piece therefor having a level bottom with a groove therein to engage the contact end of said arm and means on said piece for the removable support of 'the lother end oi' thc arm during the grinding process.

4: Atool for facilitating the regi'inding prisinp al band piece therefor having a level bottom with a cross groove therein to cn.- gage the contact end of said arm, means `(if/ignition contacts 'on breaker arms, com'- iso ' pivoted membcron said bottom with the contact end of said meeste said groove to form a resilient rest for saidl ing: the 5. A

grinding process.

tool for facilitating the regrinding of ignition contacts on breaker arms, comprising a han-d piece therefor having a level a cross groove therein to eugage the contact end of said'arm, means in said groove to resiliently support said end, and adjustable means on said, hand piece to removably support the; other end of said arm.

f6: A tool for facilitating i the lregrindngr o 1 ition contacts on breaker yarms, comprising a hand piece therefor having a level bottom with a cross groove therein to engage the contact end of said arm, 'a guide piece projecting from saidbottom to-guide said hand piece rectilinearly along one side of a' grind stoneg and means on said piece for the removable support of the other end of said arm.

7. A toolfor facilitating the reg'rinding of .ignition contacts on" breaker Vvarms, comrising a hand piecetlerefor 'having a level ottom :with "a contact mnd o said arm, an piece engage the other end of means to resiliently support arm. l 8. A tool for facilitating the regrinding of ignition contacts on breaker arms, comto removably said arm, and

stone and mean oove therein to engage the eccentrically in saidfgroovo piece to support said arm while grinding, having a erom groove vto enga e the contact end of said arm, an adjnsta le pin on said piece to removably support the perforated end of said arm and means for resiliently supporting in said groove the contact end of said arm.

9. ln a tool of the character described, a hand piece4 having la level bottom with ooves therein for the engagement of contact holders, a resiliently supported member in one of said grooves to engage one'of said contact holders, resilient means extending across the other groove to serve as a rest for the contact end oi' another contact holder and meansl on movably support the other end o said last named contact holder.

prising a hand FMLA tool of the character described,

having a level botccmprising a hand piece grinding surface,

tom to bear evenly on the a guide piece to gui linearly along one side surface of the grindon said hand piece 'for supporting contact holders during the grinding process. v

ln testimony whereof, we ax our signatures in presence of two witnesses.

STEFAN URBAN. JAMES T. MoNAlB.

Witnesses:

MAX D. OBDMANN, A. M. WAmNBi-ine.

said hand piece to re-- de said hand piece recti- 

